USB Device not recognized???? HELP!!

This only started this morning - every couple of second, I get that annoying bally ding/dong noise and a balloon appears from the system tray telling me 'One of the USB devices attached to this computer has malfunctioned, and Windows does not recognize it. For assistance in solving this problem, click this message' - which I do, a window appears 'USB not recognized - the location of the device is shown in bold text' - but there is NOTHING showing in bold text or otherwise!! I've installed nothing to set this off. APART from a new Java update this morning. Could it be this please?

The device I was connecting via USB is my Canon Camera - works perfectly fine and the images uploaded OK too.

Morning Chaps, many thanks for your replies. I have done a sys restore and ***crossed Fingers*** it has not recurred. I've also just connected the camera and it recognised it straight away without probs. That 'ding/dong' noice was getting RIGHT up my nose ... almost to the throw-the-lappy-out-the-window stage!!

Could be a faulty motherboard. My pc does it randomly after pc has been on for > an hour. When it has happened my 4 rear ports stop working but the two front ports continue to work OK. I've given up trying to fix it and now just live with it.